I have been using the allopen Plugin in a JEE Environment especially for the use with CDI (Injection and Interceptors).
It was working just fine until I updated to Kotlin 1.1.2 (Problem persists in 1.1.3).

It seems that the behavior of the plugin changed in a way which causes private methods of a class to remain final.
This makes the class not proxy-able for weld and causes deployments to fail. I did not change any configuration other than the kotlin version.

Is this a bug or intended behavior? How can I get CDI-Interceptors to work again?

EDIT: Provided an example.

The following kotlin class (Injectable is the annotation activating the allOpen-Plugin):